ON THE USE OF MULTI-FREQUENCY SAR DATA TO IMPROVE THE MONITORING OF INTERTIDAL FLATS ON THE GERMAN NORTH SEA COAST

摘要

We demonstrate that Synthetic Aperture Radar (SAR) data have great potential to improve an existing monitoring system for intertidal flats and to complement the classification of sediments, macrophytes, and mussels in the German Wadden Sea. Multi-satellite SAR data acquired at different radar bands (L, C, and X band, from ALOS PALSAR, from ERS SAR, Radarsat- 2 and ENVISAT ASAR, and from TerraSAR-X , respectively) were used to analyse their potential for crude sediment classification on dry-fallen intertidal flats and for detecting benthic fauna such as blue mussel or oyster beds. We show that both multi-satellite and multi-temporal analyses provide valuable input for the routine monitoring of exposed intertidal flats on the German North Sea Coast. In addition, we demonstrate that high-resolution SAR is capable of detecting residuals of historical land use in areas that were lost to the sea during major storm surges in the 13th and 17th centuries.